Hitachi RAS-50FH5 - Auto Sweep Motor Circuit

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4. Auto Sweep Motor Circuit
● Fig. 4-1 shows the Auto sweep motor drive circuit; the signals shown in Fig.4-2 are output from pins
15 – 18 of microcomputer.
● As the microcomputer’s outputs change as shown in Fig.4-2, the core of the auto sweep motor is excited
to turn the rotor. Table 4-1 shows the rotation angle of horizontal air deflectors.
Table 4-1 Auto sweep Motor Rotation
Rotation angle per step (˚ ) Time per step (ms.)
0.0882 10Horizontal air deflectors
Microcomputer pins Step width
Horizontal air
deflectors: 10ms.
Horizontal air deflectors
15
16
17
18
12345678
Fig.4-2 Microcomputer Output Signals
10
11
8
9
12
0V
7
6
5
4
18
17
16
Microcomputer
IC711
C711 C712 C713
Rotor
Auto sweep motor for
horizontal air defectors
15
12V
13
Fig.4-1